Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.2	$ 3.7
Preferred stock, shares authorized	25.0	25.0
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	650.0	650.0
Common stock, shares issued	154.5	154.5
Common stock, shares outstanding	119.2	119.0
Treasury stock, shares	35.3	35.5